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Elina [12.6K]
3 years ago
13

To the nearest tent what is the area of circle whose diameter is 21 inches

Mathematics
1 answer:
xxMikexx [17]3 years ago
8 0

Answer:

It depends

Step-by-step explanation:

Area of a circle is given by

A = pi *r^2

We can find the radius by taking 1/2 of the diameter

r= 1/2(21)

r = 10.5

A = pi * (10.5)^2

A = 110.25 pi

Approximating pi with 3.14

A = 110.25 * 3.14

A =346.185 in^2

To the nearest tenth

A = 346.2 in^2

If we use the pi button on the calculator

A = 346.3605901

Rounding to the nearest tenth

A = 346.4 in^2

You need to determine whether you approximate pi by 3.14 or use the pi button on your calculator

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A pair of jeans cost $32 last year this year they cost $38 what was the percent increase? PLEASE ANSWER NEED HELP!
garik1379 [7]

Answer:

18.75%

Step-by-step explanation:

percent increase = \frac{increase}{original cost} × 100%

Increase in cost = $38 - $32 = $6

percent increase = \frac{6}{32} × 100% = \frac{6(100)}{32} = 18.75%


5 0
3 years ago
A parent volunteer group is raising money by making custom hats to sell at school activities.they plan to sell the hats for $10.
Hunter-Best [27]

Answer:

Money raised($)= 6n-50

Step-by-step explanation:

they plan to sell the hats for $10. each hat $4 to make and they spend $50 for advertising.

If their are no number of hats

Cost = 50+4n

Money gotten from the n number of hats= 10(n)

If they are to make profit, the money gotten from the sales of hats should be bigger than the total cost

Money raised = money from sales- cost

Money raised= 10n -4n-50

Money raised($)= 6n-50

8 0
3 years ago
Simplify the expression shown. You must show your work to receive credit.
ZanzabumX [31]

ANSWER

12 \sqrt{5}

EXPLANATION

The given expression is

\sqrt{2}  \times  \sqrt{72}  \times  \sqrt{5}

The middle radical contains a perfect square.

\sqrt{2}  \times  \sqrt{36 \times 2}  \times  \sqrt{5}

\sqrt{2}  \times  \sqrt{36}   \times  \sqrt{2} \times  \sqrt{5}

6\sqrt{2}  \times  \sqrt{2} \times  \sqrt{5}

Note that:

\sqrt{a}  \times  \sqrt{a}  = a

6\times 2 \sqrt{5}  = 12 \sqrt{5}

4 0
3 years ago
What is the answer to 6(1+8n)=-39+3n
MissTica

For this case we must simplify the following expression:

6 (1 + 8n) = - 39 + 3n

We apply distributive property on the left side of the equation:

6 * 1 + 6 * 8n = -39 + 3n\\6 + 48n = -39 + 3n

We subtract 3n from both sides of the equation:

6 + 48n-3n = -39\\6 + 45n = -39

We subtract 6 from both sides of the equation:

45n = -39-6\\45n = -45

We divide between 45 on both sides of the equation:

n = \frac {-45} {45}\\n = -1

Answer:

n = -1

5 0
3 years ago
Find the midpoint of the line segment with end coordinates of: ( 2 , 1 ) and ( 4 , 5 )
Valentin [98]

Step-by-step explanation:

x1=2. y1=1. x2=4. y2=5

by midpoint formula,

2+ 4/2 = 6/2 =3

1+5 /2 =6/2 = 3

therefore,the midpoints are (3,3)

<h2>Hope this helps :></h2><h2></h2><h2>From Cambridge</h2><h2></h2><h2>Please give brainliest</h2>
4 0
3 years ago
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